Sleep, activity and fatigue
Fatigue with leukemia is not like ordinary tiredness: it may not go away after sleep, and it can make even everyday tasks hard. It is not laziness but a real effect of the illness and its treatment. The good news is that looking for causes, planning your energy, safe movement and good sleep habits can reduce fatigue. This topic explains them step by step.
01Short answer
02Simple explanation
Fatigue is one of the most common symptoms of leukemia and its treatment. It feels like heaviness in the body, lack of energy and difficulty concentrating, and it may not go away after sleep.
Fatigue has many causes: low red cells (anemia), infection, pain, poor sleep, anxiety and depression, too little food and fluid, and some medicines. Some of these can be fixed.
Patients used to be told to “rest as much as possible”. We now know that staying in bed for long periods weakens the muscles and makes fatigue worse. Safe, gentle movement actually builds energy.
Good sleep is important for recovery. Hospital noise, steroids, anxiety and night-time trips to the toilet can disturb sleep. Simple habits help improve it.
Think of your energy as a “bank account”: there is a limited amount each day. Spend it on what matters most, and ask your loved ones for help with the rest.
03Scientific explanation
Movement and fatigue: the 2022 ASCO guideline recommends regular aerobic and resistance exercise during treatment; it improves fitness and strength and reduces fatigue. According to the 2019 ACSM consensus, exercise is generally safe for people with cancer, and the key rule is to “avoid inactivity”.
In blood cancers: according to a 2019 Cochrane review (18 trials, 1,892 participants; mostly AML, ALL, lymphoma and myeloma, some during transplant; mostly walking programmes), aerobic exercise probably reduces fatigue (moderate-certainty evidence) and might slightly improve depression. No difference in deaths was found.
Managing fatigue: the 2024 ASCO and SIO guideline recommends exercise, cognitive behavioural therapy, mindfulness programmes, and tai chi or qigong to reduce fatigue during treatment. The 2020 ESMO guidelines stress looking for treatable causes such as anemia, pain, sleep problems and depression. If herbal products are suggested, talk to your hematologist first.
Insomnia: according to a 2016 meta-analysis (8 randomised trials, 752 patients), cognitive behavioural therapy for insomnia (CBT-I) improved sleep efficiency and shortened the time taken to fall asleep, with effects lasting up to 6 months. According to NCI, sleep problems are very common in people with cancer and can be treated.
04What happens in the body?
Tell your team about fatigue
Rating your fatigue from 0 to 10 and writing it down helps your doctor see changes. Causes can be checked: a transfusion for anemia; treatment for pain, nausea, depression or sleep problems. If fatigue is sudden and very severe, or comes with breathlessness, chest pain, a fever or confusion, call straight away.
Planning your energy
Work out the times of day when you have the most energy and put important tasks there. Break big jobs into small parts and rest in between. Sit down to do tasks and keep things you need within reach. Asking loved ones to help with cooking, shopping or childcare is not a weakness.
Moving safely
Start small: a few minutes of walking around the ward or home, stretching and light strength exercises. Build up gradually. Stop if you have a fever, an infection, a racing heart, severe dizziness or breathlessness. When platelets are low, avoid falls, knocks and heavy lifting. If you have a catheter, ask your team about swimming and using that arm for heavy tasks.
Neutropenia and public places
When neutrophils are low, a walk outdoors in quiet places is safer than crowded gyms and public swimming pools. Light exercise at home, yoga or breathing exercises are good alternatives. Your team will tell you which activities are possible, and when, based on your blood tests.
Habits for good sleep
Try to go to bed and get up at the same time every day. Get out into daylight in the morning. Keep daytime naps short and before mid-afternoon. Avoid caffeine after midday and heavy meals in the evening. Keep the bedroom dark, cool and quiet, and put screens away before bed. In hospital, earplugs and an eye mask can help.
Sleeping pills and insomnia
Steroids can disturb sleep; do not change when you take them on your own, but ask your team. Do not take someone else’s sleeping pills or supplements such as melatonin on your own initiative. If insomnia lasts for weeks, say so; cognitive behavioural therapy and other methods work well.
05Four steps against fatigue
Find the causes, plan your energy, keep moving and sleep well.
06Your situation and activity: a general guide
| Situation | What is usually fine | What to avoid |
|---|---|---|
| Fever or infection | Rest and call your team | Any exercise |
| Low platelets | Gentle walking, stretching | Risk of falls, contact sports, heavy lifting |
| Low hemoglobin | Short walks at an easy pace | Effort that causes breathlessness or dizziness |
| Neutropenia | Walks outdoors in quiet places; exercise at home | Crowded gyms, public swimming pools |
| Catheter (PICC, central line) | Walking and light movement if your team agrees | Swimming, heavy lifting with that arm |
| Bone pain | Pain-free movements | Putting strain on the painful area |
* This table is general information. Your hematology team decides which activity is safe for you and any limits based on your blood counts.
07Key terms
- Cancer-related fatigue
- Lasting tiredness caused by the illness and treatment that does not fully go away with rest.
- Anemia
- Low red cells and hemoglobin.
- Aerobic exercise
- Movement that works the heart and breathing, such as walking.
- Resistance exercise
- Movements that strengthen the muscles.
- Energy conservation
- Planning daily tasks so that energy goes to what matters most.
- Insomnia
- Ongoing difficulty falling asleep or staying asleep.
- CBT-I
- Cognitive behavioural therapy for insomnia.
- Mindfulness
- Exercises that focus attention on the present moment.
08Key points
- Fatigue is a real symptom; tell your team.
- Some causes, such as anemia, can be treated.
- Avoid complete inactivity.
- Small, safe, regular movement builds energy.
- Do not exercise with a fever.
- Protect yourself from falls when platelets are low.
- Keep a regular sleep routine.
- Long-lasting insomnia can be treated.
09Frequently asked questions
Does fatigue mean the treatment is not working?
No. Fatigue is very common even when treatment is going well. But new fatigue, or fatigue that suddenly gets worse, should be reported to your team so the cause can be checked.
Can I go to the gym during treatment?
It depends on your blood counts and stage of treatment. Crowded gyms are not advised during neutropenia. Starting with light exercise at home and outdoors is safer.
Are daytime naps harmful?
A short nap can restore energy. Long or late naps can disturb night-time sleep, though, so keep them short and before mid-afternoon.
I cannot sleep while taking steroids. What can I do?
This is a common effect of steroids. Do not change the timing yourself; ask your team, as taking them in the morning sometimes helps. A calm evening routine is useful too.
Can my child play during treatment?
In most cases, yes; play is both movement and joy for a child. Avoid games with a risk of falls and knocks when platelets are low, and crowded places during neutropenia. The children’s hematologist will give you specific rules.
How long does fatigue last after treatment?
It usually eases gradually over months, sometimes longer. After treatment, movement, CBT and mindfulness still help. Discuss long-lasting fatigue at your follow-up visits.
10Questions for your doctor
Take these questions to your appointment. The ones you save are collected on the “My questions” page and stay on this device only.
Which physical activity is safe in my current condition?
Could my tiredness be caused by anaemia or something else?
What can we do about my sleep problems?
Can I see a physiotherapist or rehabilitation specialist?
12Sources
- National Cancer Institute (NCI). Fatigue and Cancer Treatment
- National Cancer Institute (NCI). Fatigue (PDQ®) – Patient Version
- National Cancer Institute (NCI). Sleep Disorders (PDQ®) – Patient Version
- American Cancer Society. Cancer-related Fatigue
- American Cancer Society. Physical Activity and the Person with Cancer
- Cancer.Net (ASCO). Fatigue
- Macmillan Cancer Support. Tiredness (fatigue) and cancer
- World Health Organization (WHO). Physical activity — fact sheet
- Medicine & Science in Sports & Exercise, 2019. Exercise Guidelines for Cancer Survivors: Consensus Statement from International Multidisciplinary Roundtable
- Journal of Clinical Oncology, 2022. Exercise, Diet, and Weight Management During Cancer Treatment: ASCO Guideline
- Journal of Clinical Oncology, 2024. Management of Fatigue in Adult Survivors of Cancer: ASCO–Society for Integrative Oncology Guideline Update
- Annals of Oncology, 2020. Cancer-related fatigue: ESMO Clinical Practice Guidelines for diagnosis and treatment
- Cochrane Database of Systematic Reviews, 2019. Aerobic physical exercise for adult patients with haematological malignancies
- Sleep Medicine Reviews, 2016. A systematic review and meta-analysis of randomized controlled trials of cognitive behavior therapy for insomnia (CBT-I) in cancer survivors